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Lehigh Tunnels
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| Service: | NATM design, instrumentation and construction supervision services; waterproofing system design and rehabilitation support services.
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| Estimated cost: | Commencement: | March 25, 1987
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Completion date: | December 25, 1991
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| Location: | Route 283, Eisenhower Blvd Allentown, PA 17034 United States |
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| Technical data: | New highway tunnel, two lanes, 28 ft (8.5 m) x 40 ft (12.1 m) x 4,265 ft (1300 m). Constructed using NATM with drill and blast excavation measures. Installation of PVC membrane and thermal insulation in air duct of the 50 year old, two lane road tunnel during rehabilitation. Tunnel lenght: 4,138 ft (1260 m); waterproofed area: 117,000 sqft (10870 m²). |
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| Geology description: | Sandstone, shale, siltstone. |
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| Bid cost: | Final cost: | $25 million USD
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Description
The Lehigh Tunnel No.2, part of a 4-lane motorway running East-West through Pennsylvania, was one of the first tunnels in the US built using NATM. Capacity problems of Lehigh Tunnel No.1 caused delays during peak times. The new tunnel was excavated using top heading, bench and invert excavation with shotcrete support. To achieve a completely dry tunnel a PVC membrane was installed between primary shotcrete lining and the final cast-in-place lining. Tunnel rehabilitation including the installation of a PVC membrane and thermal insulation in the air duct was performed to the original tunnel.
